INVESTIGADORES
ZURITA Alfredo Eduardo
congresos y reuniones científicas
Título:
The most complete known Neogene Glyptodontidae (Mammalia, Xenarthra) from northern South America.: taxonomic and phylogenetic implications
Autor/es:
ZURITA, A. E; GONZALEZ-RUIZ, L.; GÓMEZ-CRUZ; ARENAS MOSQUERAS, J.E.
Lugar:
Buenos Aires
Reunión:
Jornada; XXVI Jornadas Argentinas de Paleontología de Vertebrados; 2012
Institución organizadora:
APA
Resumen:
The
knowledge of northern South American Glyptodontidae Gray (Mammalia, Xenarthra,
Cingulata) is very scarce compared with that of southern South American taxa,
which are systematically studied since XIX century. Recently, the Miocene
northern taxa (originally belonging to the Glyptodontidae Propalaehoplophorinae
Asterostemma Ameghino and
Propalaehoplophorus Ameghino) have been reinterpreted as basal
Glyptodontinae, and assigned to the new genus Boreostemma Carlini et al. In this contribution we present and
describe the most complete Neogene Glyptodontidae from northern South America
(Middle Miocene of the Honda Group, La Venta, Colombia), remarking its main
taxonomic, paleobiogeographic and phylogenetic implications. The material is
represented by a complete specimen (CAL-896) in an exceptional state of
preservation. This new material completes the morphological characterization of
B. acostae and corroborates the
noticeable differences compared with Miocene southern South American
Glyptodontidae. A cladistic analysis was carried out, suggesting that the
Glyptodontinae constitutes a monophyletic group, being B. acostae Villarroel and B.
venezolensis Simpson the sister group of the remaining taxa of
Glyptodontinae, in which the traditionally recognized genera (e.g. Glyptodon Owen and Glyptotherium Osborn) emerge as natural groups. Finally, whereas
the Miocene seems to represent a diversification period for Glyptodontidae in
Southern South America, the recorded taxa in northern South America are
restricted with certainty to the Glyptodontinae Boreostemma
